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Summary of Significant Accounting Polices (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of Estimated Useful Life | For financial reporting purposes, assets are generally depreciated using the following estimated useful lives and salvage values:
|  | Lives |  | Salvage Values
Building and improvements |  | 30 years |  | 0%
Tractors |  | 80 months |  | 0%
Trailers |  | 12 years |  | $1,000
Service and other equipment |  | 3-10 years |  | 0%
Schedule Of Basic and Diluted Earnings Per Share | The computation of basic and diluted earnings per share is shown below (in thousands, except per share amounts).
| Years Ended December 31,
| 2018 |  | 2017 |  | 2016
Net income | $ | 168,148 |  |  | $ | 202,889 |  |  | $ | 79,129 |
Weighted average common shares outstanding | 71,694 |  |  | 72,270 |  |  | 72,057 |
Dilutive effect of stock-based awards | 363 |  |  | 288 |  |  | 336 |
Shares used in computing diluted earnings per share | 72,057 |  |  | 72,558 |  |  | 72,393 |
Basic earnings per share | $ | 2.35 |  |  | $ | 2.81 |  |  | $ | 1.10 |
Diluted earnings per share | $ | 2.33 |  |  | $ | 2.80 |  |  | $ | 1.09 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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